One common reason suggested to prefer PNG over GIF, was that GIF files are limited to using 256-color palettes, and therefore unsuitable for rendering color images faithfully. It turns out this isn't quite true! GIF files can, in fact, contain an arbitrary number of colors, and in this post I will show how such high-color GIF images can be constructed that are quite suitable for web use.
http://notes.tweakblogs.net/blog/8712/high-color-gif-images.html

tl;dr animavany gif moze mat rozne palety pre rozne framy